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CThunkBase.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2018-2018 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #ifndef __CTHUNK_BASE_H__
19 #define __CTHUNK_BASE_H__
20 
21 /** \defgroup platform-internal-api Platform
22  * \ingroup mbed-os-internal
23  */
24 
25 /* IRQ/Exception compatible thunk entry function */
26 typedef void (*CThunkEntry)(void);
27 
28 /**
29  * \defgroup platform_CThunkBase CThunkBase class
30  * \ingroup platform-internal-api
31  * @{
32  */
33 class CThunkBase {
34 protected:
35  typedef void (*Trampoline)(CThunkBase *);
36 
37  Trampoline _trampoline;
38 
39  /*
40  * Allocate a CThunkEntry which can be called without arguments
41  *
42  * Calling the CThunkEntry invokes the _trampoline of the
43  * given cthunk. This function traps if there are no more
44  * free thunks.
45  */
46  static CThunkEntry cthunk_alloc(CThunkBase *cthunk);
47 
48  /*
49  * Free a cthunk_entry so it can be reused
50  */
51  static void cthunk_free(CThunkEntry cthunk_entry);
52 
53 private:
54  typedef void (*CthunkFree)(CThunkEntry cthunk_entry);
55 
56  /*
57  * Table of thunk functions
58  */
59  static const CThunkEntry _thunk_table[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
60 
61  /*
62  * Table of active CThunk classes
63  */
64  static CThunkBase *_thunk_storage[MBED_CONF_PLATFORM_CTHUNK_COUNT_MAX];
65 
66  /*
67  * Lazily initialized free function pointer
68  */
69  static CthunkFree _cthunk_free_real;
70 
71  /*
72  * Actual free function
73  */
74  static void cthunk_free_real(CThunkEntry cthunk_entry);
75 
76  /*
77  * Template function which stored in the _thunk_table
78  */
79  template<int N>
80  static void thunk_entry()
81  {
82  _thunk_storage[N]->_trampoline(_thunk_storage[N]);
83  }
84 };
85 
86 /**@}*/
87 
88 #endif/*__CTHUNK_BASE_H__*/
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